11 36 046 Removing and Installing/Replacing Inlet and Exhaust Adjustment Units (N54)

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Special tools required:

11 0 300
11 4 280
11 4 281
11 4 283

IMPORTANT:

To open central bolts on adjustment units and camshafts.

Fit special tool 11 4 280. See 11 4 280 GAUGE

Necessary preliminary tasks:

Remove cylinder head cover.

Remove fastener (1) in direction of arrow.

Fig 1: Removing Fastener

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Slide in special tool 11 0 300 in direction of arrow. See 11 0 300 PLUG MANDREL

Rotate flywheel (1) at central bolt until firing TDC position at 1st cylinder is reached.

IMPORTANT: The TDC bore can be mixed up in automatic transmissions.

Fig 2: Sliding In Special Tool (11 0 300)

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With 1st cylinder in firing TDC position, inlet camshaft (1) at 6th cylinder points downwards at an angle to the left.

With 1st cylinder in firing TDC position, exhaust camshaft (2) at 6th cylinder points downwards at an angle to the right.

Installation:

If the timing is checked while the engine is installed, this can only be checked with a mirror.

Fig 3: Identifying 1st Cylinder In Firing TDC Position

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Fit special tool 11 4 283 with screws (1).

Fit special tool 11 4 281 on special tool 11 4 283.

Fig 4: Identifying Special Tool (11 4 283) On Cylinder Head

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Release central bolt of exhaust adjustment unit (1).

Release central bolt of inlet adjustment unit (2).

Tightening torque, see 11 36 1AZ im ENGINE -- TORQUE SPECIFICATIONS -- TWIN TURBO

Release chain tensioner . See 11 31 090 INSTALLING AND REMOVING/REPLACING CHAIN TENSIONER PISTON (N54)

Fig 5: Identifying Inlet & Exhaust Camshaft Bolts

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Detach exhaust adjustment unit (1) from exhaust camshaft.

Detach inlet adjustment unit (2) from inlet camshaft.

Installation:

To facilitate removal and installation of adjustment units, turn sensor gears at cutout downwards.

Fig 6: Identifying Inlet & Exhaust Adjustment Unit

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IMPORTANT:

Danger of mixing up adjustment units.
Mixing up the adjustment units will result in engine damage.

The inlet and exhaust adjustment units are different.

VANOS is marked with AUS and EX for the exhaust camshaft.

VANOS is marked with EIN and IN for the inlet camshaft.

Sensor gears can be fitted alternatively.

Fig 7: Identifying Marked With AUS & EX For Exhaust Camshaft

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Illustration number 1170-09

Fit both adjustment units on camshafts.

The installation position of the adjustment units can be freely selected.

Installation:

Replace screws (1 and 2).

Insert screws (1 and 2).

Fit chain tensioner.

Secure screws (1 and 2).

Tightening torque, see 11 36 1AZ in ENGINE -- TORQUE SPECIFICATIONS -- TWIN TURBO

Fig 8: Identifying Inlet & Exhaust Camshaft Bolts

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IMPORTANT: Incorrect installation possible.

Make sure that timing chain is guided in tensioning rail (1).

NOTE: Schematic representation on removed chain drive.

Fig 9: Identifying Timing Chain

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Remove all special tools.

Assemble engine.